DERATING ELECTRICAL STRESS ANALYSIS REPORT FOR THE SAM POWER SUPPLY Prepared by Sample Company 111 Foothill Blvd. Suite E-156 La Canada Flintridge, California 91011 Copyright 2002 by Probabilistic Software, Inc. July 2002
TABLE OF CONTENTS Section Title Page 1.0 INTRODUCTION AND SUMMARY 1 1.1 Scope 1 1.2 Objectives 1 2.0 APPLICABLE DOCUMENTS 2 2.1 Military Documents 2 2.2 Sample Company Documents 2 3.0 DERATING STRESS ANALYSIS REQUIREMENTS 4 3.1 Derating Analysis Requirements 4 3.2 Derating Stress Calculations 4 3.3 Environmental Requirements 4 4.0 DERATING STRESS ANALYSIS 7 4.1 Method of Analysis 7 4.1.1 Junction Temperature Measure of Stress 7 4.1.2 Stress Derating Analysis Data 8 4.1.3 Stress Calculations 8 4.1.4 Stress Analysis Data Format 9 4.1.5 Stress Derating Limits 9 4.2 Stress Analysis Results 9 Copyright 2002 by Probabilistic Software, Inc. 2
TABLE OF CONTENTS Figure Title Page 1 SAM Power Supply Functional Block Diagram 5 Appendix A Parts Derating Stress Analysis Data Tabulation for the A-1 SAM Power Supply Copyright 2002 by Probabilistic Software, Inc. 3
1.0 INTRODUCTION AND SUMMARY This document presents the Sample Company Parts Derating Electrical Stress Analysis Report performed on the SAM Power Supply. It was prepared in accordance with MIL-STD-975M, NASA Standard Electrical, Electronic, and Electromechanical (EEE) Parts List derating criteria. The results of this analysis indicate that all of the SAM Power Supply parts are within the specified limits of MIL-STD-975M, Appendix A. This statement is fully supported by the parts application and derating stress data presented in the Appendix A of this report. This example is not a complete report. The remaining text, mathematical models and detailed appendix data tables will be provided upon the purchase of this report. Continue to scroll down to view example appendix data tables. Copyright 2002 by Probabilistic Software, Inc. 4
APPENDIX A Parts Derating Stress Analysis Data Tabulation for the SAM Power Supply Copyright 2002 by Probabilistic Software, Inc. 5
Page 1 RELIABILITY STRESS DERATING ANALYSIS System: SAM Power Supply Assembly: Converter Schematic No.: 30684941 Part Ambient Temperature, Worst Case: 55.00 Degrees Celsius Environment: SF Prepared By: J. Smith Stress Electrical and Thermal Stress Ratio Ref. Description/ Type/ Specification -------------------------------------------- Remarks Desig. Part Number Value Actual Maximum Derating Derated Actual ------ Rated Factor Derated ------- ------------- ------- --------------- -------- -------- -------- -------- -------- ------------------------------------- U1 Intgrtd Ckt. LSTTL Mil-Std-883/ Quadruple 2-Input Positive-NAND 54LS00 H FP Class B-1 Gates. Supply Voltage 5.50 1.00 5.50 5.00 0.9 Power Dissipation (Watts) 0.031 1.00 0.031 0.024 0.8 Input Voltage 5.50 1.00 5.50 5.00 0.9 Junction Temperature ( C.) 175.00 0.57 100.00 55.52 0.6 Tc = 55 C.; θjc = 22 C./Watt. Output Current (Amperes): Pin 1 0.004 0.80 0.003 0.001 0.3 Pin 2 0.004 0.80 0.003 0.001 0.3 Pin 3 0.004 0.80 0.003 0.001 0.3 Pin 4 0.004 0.80 0.003 0.001 0.3 U2 Intgrtd Ckt. LIN BIP Mil-Std-883/ Linear, Voltage Comparators. LM139AJ H DIP Class B-1 Supply Voltage 30.00 0.90 27.00 12.00 0.4 Power Dissipation (Watts) 0.800 0.75 0.600 0.057 < 0.1 Input Voltage 36.00 1.00 36.00 12.00 0.3 Junction Temperature ( C.) 150.00 0.67 100.00 56.60 0.6 Tc = 55 C.; θjc = 28 C./Watt. Output Current (Amperes): Pin 1 0.010 0.80 0.008 0.006 0.8 Pin 2 0.010 0.80 0.008 0.006 0.8 Pin 3 0.010 0.80 0.008 0.006 0.8 Pin 4 0.010 0.80 0.008 0.001 0.1 CR1 Diode General Mil-S-19500/ 1N4148-1 Purpose 116 JANTX Junction Temperature ( C.) 175.000 0.71 125.000 55.240 0.4 Tc = 55 C.; θjc = 120 C./Watt. PIV 100.000 0.70 70.000 40.000 0.6 Power Dissipation =.002 Watts. Surge Current (Amperes) 0.399 0.50 0.200 0.150 0.8 Forward Current (Amperes) 0.160 0.50 0.080 0.002 < 0.1 VR1 Diode Zener/ Mil-S-19500/ Iz Derated (Amps.) = 1N4461 Avalnch 406 JANTX Iz Nom. + 0.5(Iz Max. - Iz Nom.) --------------------------------------------- Iz Nom. = 0.1668, Iz Max. = 0.5243 Junction Temperature ( C.) 175.000 0.71 125.000 55.850 0.4 Tc = 55 C.; θjc = 125 C./Watt. Power (Watts) 1.192 0.50 0.596 0.007 < 0.1 Zener Current (Amperes) 0.524 0.66 0.346 0.001 < 0.1 Q1 Transistor NPN/PNP Mil-S-19500/ 2N2222A 225 JANTX Junction Temperature ( C.) 150.000 0.83 125.000 55.210 0.4 Tc = 55 C.; θjc = 70 C./Watt. Power (Watts) 0.379 0.50 0.190 0.003 < 0.1 Voltage 50.000 0.75 37.500 25.000 0.7 Current (Amperes) 0.607 0.75 0.455 0.003 < 0.1 Q2 Transistor NPN/PNP Mil-S-19500/ 2N2907A 291 JANTX Junction Temperature ( C.) 150.000 0.83 125.000 56.411 0.5 Tc = 55 C.; θjc = 98 C./Watt. Power (Watts) 0.299 0.50 0.150 0.014 < 0.1 Voltage 60.000 0.75 45.000 37.000 0.8 Current (Amperes) 0.449 0.75 0.337 0.009 < 0.1 R1 Resistor 1.00K Mil-R-39008, S RCR07G102JS Ohms Insltd Fxd Comp Maximum Operating Temp. ( C.) 130.000 1.00 130.000 55.000 0.4 Power (Watts) 0.250 0.60 0.150 0.001 < 0.1 Voltage 15.811 0.80 12.649 1.000 < 0.1 Copyright 2002 by Probabilistic Software, Inc. 6
Page 2 RELIABILITY STRESS DERATING ANALYSIS System: SAM Power Supply Assembly: Converter Schematic No.: 30684941 Part Ambient Temperature, Worst Case: 55.00 Degrees Celsius Environment: SF Prepared By: J. Smith Stress Electrical and Thermal Stress Ratio Ref. Description/ Type/ Specification -------------------------------------------- Remarks Desig. Part Number Value Actual Maximum Derating Derated Actual ------ Rated Factor Derated ------- ------------- ------- --------------- -------- -------- -------- -------- -------- ------------------------------------- R2 Resistor 121.00 Mil-R-39007, P RWR74S1210FP Ohms Power Fixed WW Maximum Operating Temp. ( C.) 275.000 1.00 275.000 55.000 0.2 Power (Watts) 5.000 0.50 2.486 0.065 < 0.1 Voltage 23.074 0.80 18.459 2.804 0.2 R3 Resistor 500.00 Mil-R-39035, P RJR24FW501P Ohms Trimmer NonWW Maximum Operating Temp. ( C.) 150.000 1.00 150.000 55.000 0.4 Power (Watts) 0.500 0.60 0.300 0.004 < 0.1 Voltage 2.230 0.80 1.784 1.414 0.8 R4 Resistor 50.00 Mil-R-83401,Mil M83401/01 Ohms Netwrk Fxd Film Maximum Operating Temp. ( C.) 125.000 1.00 125.000 55.000 0.4 Power (Watts) 1.750 0.60 1.050 0.800 0.8 Voltage 9.354 0.80 7.483 6.325 0.8 C1 Capacitor 100.00 Mil-C-39014, P CKR06BX104KP nf Ceramc,Gen.Pur. Maximum Operating Temp. ( C.) 85.000 1.00 85.000 55.000 0.6 Voltage 100.00 0.60 60.00 25.00 0.4 C2 Capacitor 470.00 Mil-C-39001, P CMR06F471JPDP pf Mica, Dipped Maximum Operating Temp. ( C.) 125.000 1.00 125.000 55.000 0.4 Voltage 500.00 0.50 250.00 24.00 < 0.1 C3 Capacitor 33.00 Mil-C-39006, P Slug,Hermetic Construction. CLR73BH330KGP uf Tntlm Elctrlytc Maximum Operating Temp. ( C.) 125.000 0.88 110.000 55.000 0.5 Voltage 30.00 0.60 18.00 12.00 0.7 C4 Capacitor 47.00 Mil-C-39003, P CSR13F476KP uf Tntlm Elctrlytc Maximum Operating Temp. ( C.) 125.000 0.88 110.000 55.000 0.5 Voltage 35.00 0.50 17.50 12.00 0.7 T1 Transformer Power Mil-T-27,Mil TF4R03GA203 Audio,Pwr,HiPwr Maximum Operating Temp. ( C.) 130.00 0.81 105.000 75.000 0.7 Voltage 200.000 0.50 100.000 85.000 0.9 L1 Coil Variabl Mil-C-15305,Mil CL3500GA203 Fxd and Var, RF Maximum Operating Temp. ( C.) 125.00 0.84 105.000 75.000 0.7 Voltage 200.000 0.50 100.000 85.000 0.9 J1 Connector 20 Ga. Mil-C-24308,Mil 22 Active Contacts. G06 Series Rack and Panel Parameter: Applied stress of less than 50 volts Current per Contact (Amperes) 3.700 0.400 0.1 is negligible. Copyright 2002 by Probabilistic Software, Inc. 7